The Global Truform Quilt Fabric Black Multi-tilter Task Chair with a ratchet back height adapts to various body heights. To reduce the strain behind the knees, this black multi-tilter chair comes with a contoured waterfall edge seat. Its multi-tilter mechanism with tilt lock allows you to lean back or bend forward conveniently and work for hours at length. You can also adjust the width and height of the arm rests for added convenience.